Mean (± SE) soil chemical parameters and indicators of net primary productivity (NPP) measured for each of the four fertilization treatments.

Samples were collected two years (for soil parameters) or 2.7 years (for NPP parameters) after initial fertilization. None of the treatment means were significantly different from the control (Dunnett’s Test, with significance of P < 0.05). For methodological details refer to [29].
a Extracted with a Mehlich I solution [62].
b Average dissolved inorganic nitrogen (DIN) calculated from the sum of nitrate and ammonium concentrations.
c Average of total diameter at breast height (DBH) increase in each plot, calculated as Σ(DBH at 2.7 years)–Σ(DBH at the onset of the study) for all trees larger than 10 cm DBH and 10 small trees (5 cm >DBH> 10 cm) per plot.
d Average of percent of trees in each plot that grew between 2–2.7 years after initial fertilization for the same trees as above.
e Average relative growth rate (RGR) throughout the course of the study, calculated as the slope of a line fitted through the log-transformed diameter values at each tree census, for the same trees as above.
f Average rate of foliar litterfall collected in mesh traps between 1–2 years after initial fertilization.
g Average root biomass for 0-10cm deep cores collected in each plot, 2 years after initial fertilization.
h Average fine root growth calculated from ingrowth cores, which were installed 10 cm deep, at the onset of the study and were removed 2 years after initial fertilization.
Mean (± SE) soil chemical parameters and indicators of net primary productivity (NPP) measured for each of the four fertilization treatments.